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gayaneshka [121]
3 years ago
13

Analyze the following chemical combinationsa) MgOb)CaCl2c) Na2O​

Chemistry
1 answer:
Rashid [163]3 years ago
8 0
The answer is B for sure
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Kostya randomly chooses a number from 1 to 10. What is the probability he chooses a number less than 5?
Ghella [55]
A. 1/2

Explanation- There is a 5/10 chance of choosing on of the numbers which simplifies to 1/2
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If the mass of 3 black beans it's 0.7 what's the mass of one bean?
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Answer:0.233333333

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Select a word from the drop-down menu to correctly complete the statement.
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How many moles of Cu(OH)2 are soluble in 1L of sodium hydroxide (NaOH) when the pH is 8.23?
Morgarella [4.7K]

Answer:

4.96E-8 moles of Cu(OH)2

Explanation:

Kps es the constant referring to how much a substance can be dissolved in water. Using Kps, it is possible to know the concentration of weak electrolytes. Then, pKps is the minus logarithm of Kps.

Now, we know that sodium hydroxide (NaOH) is a strong electrolyte, who is completely dissolved in water. Therefore the pH depends only on OH concentration originating from NaOH. Let us to figure out how much is that OH concentration.

pH= -log[H]\\pH= -log (\frac{kw}{[OH]})

8.23 = - log(\frac{Kw}{[OH]} \\10^{-8.23} = Kw/[OH]\\ [OH] = Kw/10^{-8.23}

[OH]=1.69E-6

This concentration of OH affects the disociation of Cu(OH)2. Let us see the dissociation reaction:

Cu(OH)_2 -> Cu^{2+} + 2OH^-

In the equilibrum, exist a concentration of OH already, that we knew, and it will be added that from dissociation, called "s":

The expression for Kps is:

Kps= [Cu^{2+}] [OH]^2

The moles of (CuOH)2 soluble are limitated for the concentration of OH present, according to the next equation.

Kps= s*(2s+1.69E-6)^2

"s" is the soluble quantity of Cu(OH)2.

The solution for this third grade equation is s=4.96E-8 mol/L

Now, let us calculate the moles in 1 L:

moles Cu(OH)_2 = 4.96E-8 mol/L * 1 L = 4.96E-8 moles

7 0
3 years ago
Is my current answer correct? if not, please correct me​
MAVERICK [17]

Answer:

Yes you’re correct :)

Explanation:

4 0
3 years ago
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